@dip1059/bitcoinjs-lib/src/cashaddr/base32.js

bitcoinjs-lib with some other btc based network support. Cloned from https://github.com/junderw/bitcoinjs-lib/tree/cashv5

'use strict';
Object.defineProperty(exports, '__esModule', { value: true });
/**
 * @license
 * https://github.com/bitcoincashjs/cashaddr
 * Copyright (c) 2017-2018 Emilio Almansi
 * Distributed under the MIT software license, see the accompanying
 * file LICENSE or http://www.opensource.org/licenses/mit-license.php.
 */
const validation_1 = require('./validation');
/**
 * Base32 encoding and decoding.
 *
 * @module base32
 */
/**
 * Charset containing the 32 symbols used in the base32 encoding.
 * @private
 */
const CHARSET = 'qpzry9x8gf2tvdw0s3jn54khce6mua7l';
/**
 * Inverted index mapping each symbol into its index within the charset.
 * @private
 */
const CHARSET_INVERSE_INDEX = {
  q: 0,
  p: 1,
  z: 2,
  r: 3,
  y: 4,
  9: 5,
  x: 6,
  8: 7,
  g: 8,
  f: 9,
  2: 10,
  t: 11,
  v: 12,
  d: 13,
  w: 14,
  0: 15,
  s: 16,
  3: 17,
  j: 18,
  n: 19,
  5: 20,
  4: 21,
  k: 22,
  h: 23,
  c: 24,
  e: 25,
  6: 26,
  m: 27,
  u: 28,
  a: 29,
  7: 30,
  l: 31,
};
/**
 * Encodes the given array of 5-bit integers as a base32-encoded string.
 *
 * @static
 * @param {Uint8Array} data Array of integers between 0 and 31 inclusive.
 * @returns {string}
 * @throws {ValidationError}
 */
function encode(data) {
  validation_1.validate(
    data instanceof Uint8Array,
    'Invalid data: ' + data + '.',
  );
  let base32 = '';
  for (const value of data) {
    validation_1.validate(
      0 <= value && value < 32,
      'Invalid value: ' + value + '.',
    );
    base32 += CHARSET[value];
  }
  return base32;
}
exports.encode = encode;
/**
 * Decodes the given base32-encoded string into an array of 5-bit integers.
 *
 * @static
 * @param {string} string
 * @returns {Uint8Array}
 * @throws {ValidationError}
 */
function decode(strng) {
  validation_1.validate(
    typeof strng === 'string',
    'Invalid base32-encoded string: ' + strng + '.',
  );
  const data = new Uint8Array(strng.length);
  for (let i = 0; i < strng.length; ++i) {
    const value = strng[i];
    validation_1.validate(
      value in CHARSET_INVERSE_INDEX,
      'Invalid value: ' + value + '.',
    );
    data[i] = CHARSET_INVERSE_INDEX[value];
  }
  return data;
}
exports.decode = decode;